body{font-family:Arial,sans-serif;background-color:#79808c;margin:0;padding:0}.app-container{max-width:400px;margin:100px auto;padding:30px;background-color:#fff;border-radius:12px;box-shadow:0 8px 16px #0000001a;text-align:center}.heading{margin-bottom:20px;color:#333}.input{width:100%;padding:12px;margin:10px 0;border:1px solid #ccc;border-radius:8px;font-size:16px}.btn{width:100%;padding:12px;background-color:#4c78af;color:#fff;border:none;border-radius:8px;font-size:16px;cursor:pointer;margin-top:10px}.btn:hover{background-color:#6ec572}body{margin:0;padding:0;background-color:#f2f4f8;font-family:Arial,sans-serif}.chat-container{max-width:500px;margin-top:20px;margin-left:auto;margin-right:auto;padding:20px;background-color:#fff;border-radius:12px;box-shadow:0 8px 16px #0000001a}h1{text-align:center;margin-bottom:20px;color:#333}.chat-box{display:flex;flex-direction:column;height:300px;overflow-y:auto;border-radius:8px;border:1px solid #ccc;padding:10px;margin-bottom:15px;background-color:#f9f9f9}.sent{align-self:flex-end;background-color:#5bd498;color:#000;padding:5.5px 15px;border-radius:10px 10px 0/10px 10px 0px;margin:5px;min-width:15%;max-width:60%;text-align:start}.received{align-self:flex-start;background-color:#a1a9a1;padding:5.5px 13px;border-radius:10px 10px 10px 0/10px 10px 10px 0px;margin:5px;min-width:15%;max-width:60%;text-align:left}.input-container{display:flex;gap:10px}input[type=text]{flex:1;padding:12px;font-size:16px;border-radius:8px;border:1px solid #ccc}button{padding:12px 16px;background-color:#4caf50;color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:16px}button:hover{background-color:#45a049}